Trigger for insert, update, delete - sql-server

Question

I want to insert rows into the audit table whenever an insert, update or delete takes place in the master table "Table1" - doesn't matter which column is changed/inserted. I also want to add I, U or D on insert, update or delete. For insert and delete I am checking if rows exist in the inserted and deleted table. What is the best way to approach update.
My code for insert and delete is :
CREATE TRIGGER [dbo].[tr_Table1_InsertUpdate_Table1History_Insert]
ON [dbo].[Table1]
FOR INSERT, DELETE, UPDATE
AS
BEGIN
IF EXISTS(SELECT * FROM Inserted)
BEGIN
INSERT INTO Table1History(...., ModificationType)
SELECT ..., 'I'
FROM Inserted
END
IF EXISTS(SELECT * FROM Deleted)
BEGIN
INSERT INTO Table1History(..., ModificationType)
SELECT ..., 'D'
FROM Deleted
END
END
GO
Kindly help!

Answer 1

For updates, the original values for the row will be added to the deleted table, and the new values for the row will be added to the inserted table. So, to identify inserts, deletes and updates you would do the following
Inserts - get the rows from inserted that are not in deleted
Deletes - get the rows from deleted that are not in inserted.
Updates - get the rows that are in both inserted and deleted

Answer 2

Below is an example of a trigger generated by ApexSQL Audit
It’s not a cheap tool but you can probably use it in trial mode to get the job done.
Notice the INSERT INTO dbo.AUDIT_LOG_DATA part and repeat it for every column you want to audit.
There are two tables in the background for storing the data and several stored procedures as well but this will get you going in the right direction.
CREATE TRIGGER [dbo].[tr_d_AUDIT_TableName]
ON [dbo].[TableName]
FOR DELETE
NOT FOR REPLICATION
AS
BEGIN
DECLARE
#IDENTITY_SAVE varchar(50),
#AUDIT_LOG_TRANSACTION_ID Int,
#PRIM_KEY nvarchar(4000),
--#TABLE_NAME nvarchar(4000),
#ROWS_COUNT int
SET NOCOUNT ON
Select #ROWS_COUNT=count(*) from deleted
Set #IDENTITY_SAVE = CAST(IsNull(##IDENTITY,1) AS varchar(50))
INSERT
INTO dbo.AUDIT_LOG_TRANSACTIONS
(
TABLE_NAME,
TABLE_SCHEMA,
AUDIT_ACTION_ID,
HOST_NAME,
APP_NAME,
MODIFIED_BY,
MODIFIED_DATE,
AFFECTED_ROWS,
[DATABASE]
)
values(
'TableName',
'dbo',
3, -- ACTION ID For DELETE
CASE
WHEN LEN(HOST_NAME()) < 1 THEN ' '
ELSE HOST_NAME()
END,
CASE
WHEN LEN(APP_NAME()) < 1 THEN ' '
ELSE APP_NAME()
END,
SUSER_SNAME(),
GETDATE(),
#ROWS_COUNT,
'DatabaseName'
)
Set #AUDIT_LOG_TRANSACTION_ID = SCOPE_IDENTITY()
INSERT
INTO dbo.AUDIT_LOG_DATA
(
AUDIT_LOG_TRANSACTION_ID,
PRIMARY_KEY_DATA,
COL_NAME,
OLD_VALUE_LONG,
DATA_TYPE
, KEY1
)
SELECT
#AUDIT_LOG_TRANSACTION_ID,
convert(nvarchar(1500), IsNull('[Order_ID]='+CONVERT(nvarchar(4000), OLD.[Order_ID], 0), '[Order_ID] Is Null')),
'Order_ID',
CONVERT(nvarchar(4000), OLD.[Order_ID], 0),
'A'
, CONVERT(nvarchar(500), CONVERT(nvarchar(4000), OLD.[Order_ID], 0))
FROM deleted OLD
WHERE
OLD.[Order_ID] Is Not Null
END

Answer 3

Have you consider using AutoAudit?
AutoAudit is a SQL Server (2005, 2008)
Code-Gen utility that creates Audit
Trail Triggers with:
Created, CreatedBy, Modified, ModifiedBy, and RowVersion
(incrementing INT) columns to table
Insert event logged to Audit table
Updates old and new values logged to Audit table
Delete logs all final values to the Audit tbale
view to reconstruct deleted rows
UDF to reconstruct Row History
Schema Audit Trigger to track schema changes
Re-code-gens triggers when Alter Table changes the table